There should be an icon on your taskbar near the clock that will open the utility for your touchpad. This icon usually looks like a square that lights in different areas as you touch the touchpad. If not then try hovering over each icon to see if it represents your touch pad utility then double click (or r-click) to open the utility, you should see an option to enable/disable the TP.
If you don't have this type of icon in the task bar then look in the control panel. There may be an icon setup specifically for your touchpad or you may have to look in the mouse utility to disable.
Hope this helps...